MARK NEWMAN / SCIENCE PHOTO LIBRARY MARK NEWMAN / SCIENCE PHOTO LIBRARY
Mooney Falls (190 feet) at Havasu Canyon, part of the Havasupai Indian Reservation in north-western Arizona. The waters of Havasu Creek have a high mineral content, and calcium carbonate precipitation forms the travertine cliffs over which the water tumbles. The creek then journeys five miles to the Colorado River, to the main gorge of the Grand Canyon.
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